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Genetics Lab Practical
DNA Sequencing
13
Biology
Undergraduate 2
12/07/2010

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Term
Autoradiograph
Definition
An exposed sheet of x-ray film
Term
How many nucleotides will an autoradiogram differ from a wildtype sequence?
Definition
By a single nucleotide
Term
What does the difference between the autoradiogram and the wild type sequence represent?
Definition
An actual mutation in the DNA molecule.
Term
Bioinformatics
Definition
New field of biotechnology that is involved in storage, and manipulation of DNA sequence info from which one can obtain useful biological info
Term
When was DNA sequencing first automated?
Definition
1990's
Term
Genomics
Definition
Involves using DNA sequence information to understand the biological complexity of an organism.
Term
What were some of the first genomes to be sequenced?
Definition
Microbes, S cerevisae, H pylori
Term
What is the first step after obtaining DNA sequencing data?
Definition
To search of DNA sequence similarities using various data banks online.
Term
For sequence analysis, how many enzymatic reactions are performed?
Definition
4 separate reactions, one for each of the 4 nucleotides
Term
What does each enzymatic reaction contain when sequencing DNA?
Definition
DNA polymerase
single-stranded DNA template to be sequenced
the 4 dNTP's
isotopically labeled deoxynucleotide triphosphate
buffer
Appropraite dideoxynucleotide
Term
How much dideoxynucleotide are added to the reactions when sequencing DNA?
Definition
The amounts are carefully adjusted so that they are incorporated randomly and infrequently into the growing DNA strand. When incorporated, DNA synthesis is terminated because it no longer has a 3' end.
Term
How are products from the 4 enzymatic reactions separated?
Definition
By a vertical polyacrylamide gel
Term
Sanger "dideoxy" method
Definition
Method of sequencing using 4 enzymatic reactions that are then run on a polyacrylamide gel, and placed into contact with a sheet of x-ray film creating an autoradiogram.
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